Malicious PDF — malware analysis report

Static analysis result for SHA-256 f9c3efa9818341db…

MALICIOUS

PDF

45.4 KB Created: 2020-08-22 07:48:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: d71c6bac68b7684af88ec6bd9b6e9fee SHA-1: 91abb5e76c67388da665433276d0f8743d2fef0f SHA-256: f9c3efa9818341db160ded32ed18a7338e82e41296e21cb0e2b72ee1207751e2
152 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell

The PDF contains a large number of embedded links, many pointing to Shopify domains, but one critical link directs to a known malicious redirector at 'ttraff.com'. The document body, though heavily obfuscated, contains the text 'workout progress tracker android' and the malicious URL, suggesting a lure to disguise the malicious intent. The ML classifier strongly flagged this PDF as malicious, and the presence of a redirector link indicates an attempt to lead the user to a harmful site.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 4

  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://ttraff.com/pify?keyword=workout+progress+tracker+android
    • http://files.anjellyschick.com/uploads/1/3/1/3/131383657/buwidarejubafefeguku.pdf
    • http://wasib.artcardstang.com/uploads/1/3/0/9/130969060/c65155a6641.pdf
    • http://files.rareearthadventures.com/uploads/1/3/1/3/131383860/dekumulasejuw.pdf
    • https://cdn.shopify.com/s/files/1/0437/1572/3414/files/42528026714.pdf
    • https://cdn.shopify.com/s/files/1/0429/8221/1735/files/19336936590.pdf
    • https://cdn.shopify.com/s/files/1/0433/5376/8090/files/66745331706.pdf
    • https://cdn.shopify.com/s/files/1/0450/9237/2632/files/travel_brochure_template_publisher_free.pdf
    • https://cdn.shopify.com/s/files/1/0431/2750/5047/files/zegaxipulebumovemurigotap.pdf
    • https://cdn.shopify.com/s/files/1/0435/2324/4191/files/nowixopa.pdf
    • https://cdn.shopify.com/s/files/1/0447/1295/1961/files/kenmore_400_dryer.pdf
    • https://cdn.shopify.com/s/files/1/0435/2439/1067/files/37194524715.pdf
    • https://cdn.shopify.com/s/files/1/0440/7469/6856/files/bizosunijosasuvinitotav.pdf
    • https://cdn.shopify.com/s/files/1/0432/2911/8627/files/xowokufo.pdf
    • https://cdn.shopify.com/s/files/1/0429/6900/6236/files/74504205374.pdf
    • https://cdn.shopify.com/s/files/1/0431/2884/8538/files/dewozidotevipapujuvowoz.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000072b2.bin
e637794a116645c359d3fb9bd6b57a440791bfc868dad32d5389719621ec3317
pdf-font-stream PDF embedded font (sfnt) at offset 0x72B2 5288 bytes
font_01_sfnt_off000084d2.bin
4223eb58d8762451b6d2c14b3f92907ffc6169a11fc7a61f79b6593c4e9804fd
pdf-font-stream PDF embedded font (sfnt) at offset 0x84D2 10552 bytes